I was watching an analyst on CNBC telling us because they only sold 50 million iPhones in the 4th quarter investors are shorting the stock.

50 million would make it Apple's best quarter ever for iPhone sales.
Last quarter they sold 26.9 million iPhones. The best quarter was 2012Q1 with 37 million.
(The next figures released will be Apple's 2013Q1, their 2012Q4 ended in October.)